Dead-ball era - Wikipedia
How to Calculate ERA (Earned Run Average): 8 Steps (with Pictures)
What does ERA mean?
What does ERA mean in Baseball? - Gaimday
What Is ERA in Baseball? – Wax Pack Gods
What is ERA in Baseball: A Comprehensive Guide to the Pitching Statist – Kore Baseball Products
The Lowest ERAs in MLB History
Dead-ball era - Wikipedia
What does ERA mean?
OPINION: The Steroid Era saved baseball. So why are we erasing it? - The Samford Crimson
Dead-ball era - Wikipedia
The Rise and Fall of the Deadball Era – Society for American Baseball Research
The End of the Steroid Era? - SI Kids: Sports News for Kids, Kids Games and More
FIPping Out: The Luckiest Pitchers in Baseball - 'CATS STATS
Proof That the Steroid-Era Power Surge in Major League Baseball Has Been Stopped | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
Examining Perceptions of Baseball's Eras: A Statistical Comparison – The Sport Journal
FIPping Out: The Luckiest Pitchers in Baseball - 'CATS STATS
Fans Sickened by the Steroid Era Shouldn't Complain Now - The New York Times
Baseball Writers Reject Barry Bonds, Other 'Steroid-Era' MLB Stars From Hall Of Fame For Final Time
Modern Era-record 12 teams score double-digit runs Tuesday, one of the highest scoring days in MLB history - CBSSports.com
What is ERA (Earned Run Average)? - YouTube
The Lowest ERAs in MLB History
Eras of ERA – The Sport Journal
What is ERA in Baseball and Pitching Stats Explained - The Data Jocks
